IT Baseline Protection Manual - The Information Warfare Site

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Safeguard Catalogue - Hardware & Software Remarks ____________________________________________________________________ ......................................... not easy to detect a special tag within an HTML page, because of the complex possibilities available in the current HTML version. Unfortunately, Java applets are not consistently sent as files with the suffix .class. Instead it is also possible to use compressed files, which may have the suffix .jar (Java archive) for example. This means that a Java filter also has to know and take account of all of the compression methods supported by the browsers that are used. Another alternative for detecting programs with active content with damaging functions is to create a database with signatures, in much the same way as for programs designed to protect against computer viruses, and to compare every program downloaded from the Internet against these signatures. Unfortunately this procedure is still very much in the early stages of development, and it remains to be seen whether the resultant programs will be as effective as the programs providing protection against computer viruses. Further potential danger results from the possibility of running JavaScript from within Java. The effectiveness of graduated filtering of Java and JavaScript should therefore be examined. ____________________________________________________________________ ......................................... IT-Baseline Protection Manual: Oktober 2000
Safeguard Catalogue - Hardware & Software Remarks ____________________________________________________________________ ......................................... S 4.101 Firewalls and encryption Initiation responsibility: Head of IT Section, IT Security Management Implementation responsibility: IT Security Management, Administrators As it is impossible to predict the routes and nodes via which data will be sent over the Internet, data should always be encrypted before it is sent if at all possible. It would be useful if mechanisms to ensure that this is done were already provided in the lower layers of the protocol. First, though, a distinction should be drawn between two approaches to encryption: - Encryption at the firewall or on network switching elements that can be used for setting up secure subnetworks - Encryption on the terminal equipment that is utilised by users as the need arises, for example Encryption at the firewall In order to exchange data with external communications partners via an open network and/or to grant these partners access to your own network, it may make sense to set up virtual private networks (VPNs). All connections to and from these partners should be encrypted, so that no unauthorised users can gain access to the connections. A large number of hardware and software solutions can be used to set up encrypted connections. If it is intended to connect only a few properties to each other, hardware solutions based on symmetric cryptographic procedures, in particular, are a simple and safe choice. External network Possible cipher equipment 4 Application-Gateway Packet filter Figure: Integration of a crypto module into a firewall Encryption and decryption can be performed on different devices. For example, a hardware solution in the packet filter could be used as the cipher equipment. This makes sense in particular in cases where no unencrypted communication is to be allowed via the device. In contrast, the integration of encryption on the application gateway has the advantage of easier user administration. Furthermore, an attacker who has ____________________________________________________________________ ......................................... IT-Baseline Protection Manual: Oktober 2000 Packet filter Internal network Servers for external acces
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Bundesamt für Sicherheit in der In
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Data Transmission Systems Exchange
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